Auxiliary reversing-gear for machine-tools.



No. 700,206. Patented May 20, I902,

H. E. A. KINDERMANN. AUXILIARY REvEnsme nun FOR mAcHm-E TOOLS.

(Appiication filed Dec. 27, 1901.)

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HEINRICH EDUARD AUGUST KINDERMANN, OF CHEMNITZ, GERMANY.

AUXILIARY REVERSlNG-G EAR FOR MACHINE-TOOLS.

SPECIFICATION forming part of Letters Patent No. 700,206, dated May 20, 1902. Application filed December 27,1901. Serial No. 87,483. (No model.)

To all whom it may concern:

Be it known that I, HEINRICH EDUARD A GUST KINDERMANN, a subject of the King of Prussia, Emperor of Germany, and a resident of Chemnitz, in the Kingdom of Saxony, German Empire, have invented certain new and useful Improvements in Auxiliary Reversing-Gear for Machine-Tools having ReciprocatingMotion, of which the following is a specification.

Heretofore, as far as I am aware, machinetools with reciprocating motion'such as planers, shaping-machines, paring-machines, and the like-have all been objectionable, in that they required a much'larger amount of power the moment that the back motion was started than is needed for the actual work, this being especially the case if the said back motion is accelerated.

The object of the present invention is to avoid this defect by providing means whereby the extra forcerequired for initial reversing is not drawn from the working power, but is taken from a fiy-wheel,which is rotated either by the driving-shaft itself with the aid of an intermediate gearing or by means of some other device in a direction contrary to that in which the driving-shaft turns during the forward motion. When the machine is reversed for back motion, said fly-wheel is connected directly with the driving-shaft of the machine, so as to deliver the stored-up power to the driving-shaft and to start the reversed motion of the various parts.

I have illustrated the invention in the accompanying drawing, which is a plan view, partly in section.

In the drawing I represent the slide or reciprocating front of a planer or similar machine for carrying the tool-holder and tool, which are not shown herein,as they constitute no part of the present invention. A reciprocating motion is imparted to this slide by means of arack m and intermes hing gears c and b, the latter of which iscarried by the driving-shaft a. Motion is imparted to this shaft ineither direction by oppositely-running beltsD'an'd E, driven from any suitable source of power. A fast pulley d and loose .50 pulley d are provided for the belt D and similarly a fast pulley e and loose pulley e for the belt E, and when one belt is shifted to its fast. pulley the other is designed to be shifted to its loose pulley, and vice versa, whereby the shaft (1 may be driven'in either direction.

A fly-wheel g of suitable weight is loosely journaled upon the shaft a and has rigidly secured thereto a flange or pulley f, over which a belt (not shown) may pass, driven from any suitable source of power, but in a direction reverse to the motion of the shaft a when giving a forward or working stroke to the slide m. This pulley f is preferably made to form one member of va clutch, the other member h being'splined to the shaft to and moved by a shifting-lever c', pivotally mounted upon a fixed axis if; ,Itwill thus be seen that as long as the slide is being driven oniits forward or .workin g'stroke the fiy-wheel by having the clutch uncoupled will rotate truly upon the shaft a and in a contrary direction. When, however, themotion of the slide is to be reversed and it is desired to secure additional power for the initial backward movement, it is only-necessary to throw the clutch member 72. into engagement with the clutch-face of pulley f, thereby coupling the fiy-wheel g to the shaft a, thus securing the momentum of the heavy fiy-wheel to as sist the normal power.

I prefer to clutch and unclutch the fly-wheel automatically, and the means which I deem best for this purpose is that shown in the drawing. This comprises a nut 11*, secured to the arm i of the lever 'i and engaged by the threaded portion k of a shaft is, journaled in suitable bearings. A bar Z has a rack Z engaging a gear k on the shaft 70, and at its other end the rod carries a pin or projection Z designed to contact with stops or abutments m and m on the slide, near each extremity of the movement of the latter. Thus when the slide is nearing either extremity of its movement the contact of the abutment m or 'm with thepinZ reciprocates the rod and through the rack and gear rotates the shaft, which in its turn through screw and nut swings the lever to clutch or unclutch the fly-wheel, as the case may be.

In order to avoid sudden shock or jar when the clutch is operated, I prefer to make the arm i of spring or yielding material, as shown.

Having thus described my invention, what I claim is- 1. In a device of the class described, the combination with the slide and the drivingshaft operatively connected thereto with means for driving said shaft in either direction, of a fly-wheel mounted to rotate independently of said shaft, means for rotating said fly-wheel in a direction reverse to the forward motion of the shaft, and means for connecting said fiy-wheel to the shaft when reversing the movement of the same.

2. The combination with the slide and driving-shaft operatively connected therewith, with means for rotating it in either direction, of a fly-wheel loosely journaled on said shaft and means for automatically coupling and uncoupling said fiy-wheel to and from said shaft near the extremities of the movement of the slide.

3. The combination with the slide and driving-shaft operatively connected therewith with means for driving it in either direction, of a fly-wheel journalcd on said shaft with means for driving it, clutch mechanism for connecting said fly-wheel to and disconnecting it from the shaft, a movable bar extending into proximity to the slide, stops or abutments on the slide for moving the bar as the slide approaches either extremity of its movement, and means whereby the movement of the bar operates the clutch mechanism.

4. The combination with the slide and driving-shaft operatively connected thereto with means for driving it in either direction, of a fly-wheel loose on said shaft, means for driving the same, a clutch for connecting said wheel to and disconnecting it from the shaft, a movable bar extending into proximity to the slide, abutments on the slide for engaging the bar as the slide approaches either extremity of its stroke, and yielding connections between said bar and clutch whereby the movement of the baroperates the clutch without shock.

In witness whereof I have hereunto set my hand in presence of two witnesses.

HEINRICH EDUARD AUGUST KINDERMANN;

\Vitnesses:

EDGAR RICHTER, H. MANoT. 

